EP 1111928 A1 20010627 - Harmonic measurement of blockiness in video signals
Title (en)
Harmonic measurement of blockiness in video signals
Title (de)
Oberwellenmessung von Blockartefakten in Videosignalen
Title (fr)
Mesure d'harmoniques des artefacts de blocs d'un signal vidéo
Publication
Application
Priority
US 46992799 A 19991222
Abstract (en)
A method of measuring blockiness in a video signal generates a power spectrum for a video field of the video signal. The largest peaks of the power spectrum at the higher frequency end of the power spectrum are initially selected and a common frequency interval between peaks is determined. The contribution to the amplitude of peaks at the common frequency interval by peaks at other than the common frequency interval are subtracted from the amplitude of the peaks at the common frequency interval. The average of the corrected amplitudes of the peaks at the common frequency interval is obtained and normalized as a blockiness metric for the video signal. <IMAGE>
IPC 1-7
IPC 8 full level
H04N 7/32 (2006.01); H04N 7/26 (2006.01); H04N 7/30 (2006.01); H04N 17/00 (2006.01)
CPC (source: EP KR US)
H04N 17/00 (2013.01 - KR); H04N 19/527 (2014.11 - EP US); H04N 19/60 (2014.11 - KR); H04N 19/86 (2014.11 - EP US)
Citation (search report)
- [PX] GB 2347811 A 20000913 - INDEPENDENT TELEVISION COMMISS [GB]
- [XA] KODA H ET AL: "A NEW METHOD OF MEASURING THE BLOCKING EFFECTS OF IMAGES BASED ON CEPSTRAL INFORMATION", IEICE TRANSACTIONS ON FUNDAMENTALS OF ELECTRONICS, COMMUNICATIONS AND COMPUTER SCIENCES,JP,INSTITUTE OF ELECTRONICS INFORMATION AND COMM. ENG. TOKYO, vol. E79-A, no. 8, 1 August 1996 (1996-08-01), pages 1274 - 1282, XP000633543, ISSN: 0916-8508
- [A] HUANG J ET AL: "BLOCKING ARTEFACT REMOVAL BASED ON FREQUENCY ANALYSIS", ELECTRONICS LETTERS,IEE STEVENAGE,GB, vol. 34, no. 24, 26 November 1998 (1998-11-26), pages 2323 - 2325, XP000871287, ISSN: 0013-5194
Designated contracting state (EPC)
DE FR GB
DOCDB simple family (publication)
EP 1111928 A1 20010627; EP 1111928 B1 20061004; CN 1175678 C 20041110; CN 1309506 A 20010822; DE 60031079 D1 20061116; DE 60031079 T2 20070405; JP 2001218233 A 20010810; JP 3504609 B2 20040308; KR 100680922 B1 20070208; KR 20010061979 A 20010707; US 6437821 B1 20020820
DOCDB simple family (application)
EP 00311329 A 20001218; CN 00136482 A 20001221; DE 60031079 T 20001218; JP 2000371943 A 20001206; KR 20000071205 A 20001128; US 46992799 A 19991222